Answer:
. Which one has a greater thermal energy?
the coffee cup
Which are not combination reactions?
Check all that apply.
A. 2H2O + 2H2 + O2
B. H2 + Cl2 → 2HCI
C. Fe + MgO + Mg + FeO
D. 2Na + Cl2 → 2NaCl
Answer:
A and c
Explanation:
In A the product is added to the reactant, so the real reaction is (2H2O = 2H2+O2).
In B hydrogen and clorine are combined to give hydrochloric acid and 2 is used to balance the reaction in the product, so it's a combination reaction .
In C the case is similar to A , so the real reaction is (Fe+MgO = Mg + FeO ) this is displacement reaction where a more reactive element takes place of a less reactive element .
In D sodium reacting with Chlorine to give sodium chloride ,so we conclude that it's a combination reaction .
How many atoms are in 4.5 g of AICI3?
Answer:
2.047 × 10^22 atoms.
Explanation:
To calculate the number of atoms (nA) in AlCl3, we first need to find the number of moles in the compound, AlCl3.
Molar mass of AlCl3 = 27 + 35.5(3)
= 27 + 106.5
= 133.5g/mol
Using mole = mass/molar mass
mole = 4.5/133.5
mole = 0.034moles
number of atoms in a substance (nA) = number of moles (n) × Avagadros number or constant (6.02 × 10^23 atoms)
nA of AlCl3 = 0.034 × 6.02 × 10^23
nA = 0.2047 × 10^23
nA = 2.047 × 10^22 atoms.
14) For the reaction P4(s) + 6 Hz(9) — 4 PH3(g)
a) f 15 g of Pe were used, how many liters of PHs were produced?
b) How many liters of H2 are required to completely react with 15 g of P4?
c) How many grams of PHs will be produced if 6.0 L of H2 are used?
Molar Mass of P4: 1 mol P4 =
g
a)
L PH3
b)
L H2
Molar Mass of PH3: 1 mol PH3 =
9
c)
g PH3
A dog runs 100 meters at a speed of 5 m/s. What is his time
Answer:
20 m/s
Explanation:
have a nice day¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡
what is the total number of atoms in 3.0 grams sample of neon?
The total number of atoms : N = 8.95 x 10²²
Further explanationGiven
3 grams of Neon
Required
The number of atoms
Solution
mol of Neon :
= mass : Ar Neon
= 3 g : 20,1797 g/mol
= 0.1487
The number of atoms :
N = n x No(No=Avogaro's number)
N = 0.1487 x 6.02 x 10²³
N = 8.95 x 10²²
whoever answers first ill give brainliest! ANSWER QUICK PLS
Mr. B weighs out 22.8 grams of cobalt (II) chloride, then dissolves that CoCl2 in 500 mL of water. What is the concentration of his cobalt (II) chloride solution?
a. 3.51 M CoCl2
b. 0.351 M CoCl2
c. 0.176 M CoCl2
d. 0.0456 M CCl2
thank you so much!
Answer: b
Explanation: had the same question
ILL GIVE U BRAINLYSIT
Answer:what?
Explanation:what? Huh
what volume of 0.20 M NaCl contains 10.0 g
If the Earth could no longer sustain human life, where could we go?
Answer:
There is no place in the solar system that can sustain humans except earth. Earth is the only planet that can sustain humans according to what we know and according to the technologies we have. We can live in Mars but the environment might not be suitable for growing vegetation and it might be hard for humans to live in Mars.
Explanation:
Hope this helped!
What type of climate is characteristic of temperate grassland
A) warm weather all year long
B) Deep, fertile soil
C) Low annual precipitation
D) Giraffes, zebras, and wildebeests
Answer:
I am expecting that is option is d is correct answer
Explanation:
because in the grassland some animals can live
LAB REPORT
Lab: Charles law
I don’t know how to do this someone pls help I’m so behind I’m crying
Answer:
The physical principle known as Charles' law states that the volume of a gas equals a constant value multiplied by its temperature as measured on the Kelvin scale (zero Kelvin corresponds to -273.15 degrees Celsius
Explanation:
A 1.0-mole sample of potassium mass is?
Answer:
Here is your ans
Explanation:
potassium mass is 39.0983u
Tq
David walks 10 Km North. He turns East and walks 10 more Km. What is his distance
Answer:
20 km
Explanation:
he walks 10 km + another 10 km so 20 :)
Question 9(Multiple Choice Worth 1 points)
(05.03 LC)
Which of the following stars usually shine with the dimmest of light?
O Dwarfs
O Giants
O Main sequence stars
O Supergiants
Which energy resource produces the least amount of air pollution?
coal
natural gas
oil
hydropower
Answer:
hydropowered
Explanation:
took the test
Hydropower is the energy source that produces the least amount of air pollution. Therefore, the correct option is option D.
What is energy?Energy is The capacity or ability to do tasks, such as the ability to forcefully move an object. Energy can exist in a multitude of forms and can change from one to another, including thermal, mechanical, chemical, and nuclear energy. The flow of electric charges known as electrons is what generates electrical energy.
Energy is utilised to make a wide range of goods, power transportation, and power the appliances we use to heat and light our houses. The production of electricity is the main purpose of these various energy sources. All of these many energy sources contribute to the electrical power reserve that is then distributed to various locations via high-powered lines. Hydropower is the energy source that produces the least amount of air pollution.
Therefore, the correct option is option D.
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SnBr2
what is the name of this formula?
Which factor is responsible for the dry period
Answer:
drought
Explanation:
because it looses all of the water in the aria / desertification
What is the name of this formula: Fe3Cl? PLEASE AND THANK YOU :(
Answer:
Ferric Chloride or Iron (III) Chloride
Explanation:
Plz help me with these three please please !!!!!
Explanation:
Cations are positively charged ions with fewer electrons than protons. To partake in reaction, metals lose electrons to achieve a stable octet configuration. It has lost valence electrons and wold have a positive charge associated with it.
Potassium is a group 1 element. A metal.
Potassium has 1 valence electron so it loses the valence electron to form a stable octet.
A potassium ion has a positive charge and therefore cannot be an anion but is a cation.
The group number pretty much denotes the number of valence electrons.
Group 1 = 1
Group 2 = 2
Group 17 = 7
Group 18 = 8
HELP PLEASE IM GIVING BRAINLISTAs the amount of salt in water increases, the___________ of the water increases.
Question 2 options:
humidity
density
temperature
size
As the amount of salt in water increases, the density of the water increases. The more particles present in unit volume the more densely packed the substance.
What is density ?Density of a substance is the measure of its mass per unit volume. Density describes how closely its particles are packed. Densely packing means more particles in a unit volume.
The density of water is 1 g/ml. However, when the salinity increases, the salt solution increases in density by the solute particles. If the density of an object is less than water, it will float on it. Objects denser than water will sink on water.
As the salinity increases, density of water increases, makes the surface tension also increases, which best illustrates what happens in dead sea. Hence, option b is correct.
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When light moves from one substance to another, it can change direction. The following picture shows how this change can make an object in a glass of water seem to bend or even have disconnected pieces.
What is the term for this effect?
A.
transmission
B.
reflection
C.
refraction
D.
absorption
Why is quantum of energy important?
Answer/Explanation:
quantum of energy is important because the energy of a particle, and also how long it has had that energy, with infinite precision. Quantum, in physics, discrete natural unit, or packet, of energy, charge, angular momentum, or other physical property. the term also applicable to quanta of other forms of electromagnetic energy such as X - rays and gamma rays.
A gas has an initial volume of 15L and the pressure is at 2atm. If the temperature increases from 330K to 462K and the pressure reduced to 1 ATM, what is the new volume of the gas?
Answer:
42L
Explanation:
Using the combined gas law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the provided information in this question, P1 = 2atm, V1 = 15L, T1 = 330K, T2 = 462K, P2 = 1atm, V2 = ?
Using the formula;
P1V1/T1 = P2V2/T2
2 × 15/330 = 1 × V2/462
30/330 = V2/462
Cross multiply;
462 × 30 = 330 × V2
13860 = 330V2
V2 = 13860 ÷ 330
V2 = 42L
The new volume is 42L
Will give brainliest if correct
Based on what you have observed in the Gizmo, which of the following chemical equations represents photosynthesis?
A. Carbon dioxide plus water yields glucose (sugar) and oxygen.
B. Oxygen plus carbon dioxide yields water and glucose.
C. Glucose plus oxygen yields carbon dioxide and water.
D. Water plus glucose yields oxygen and carbon dioxide.
Answer:
A.....
Explanation:
Carbon dioxide plus water yields glucose (sugar) and oxygen.
Boron carbonate decomposes into boron oxide and carbon dioxide, how many moles of carbon dioxide are produced when 5.0 mol of boron carbonate decomposes completely?
What energy transformation occurs as the rabbit eats the grass?
A.
Chemical energy in the grass is transformed into thermal energy in the rabbit.
B.
Electrical energy in the grass is transformed into thermal energy in the rabbit.
C.
Mechanical energy in the rabbit is transformed into electrical energy in the grass.
D.
Thermal energy in the rabbit is transformed into mechanical energy in the grass.
Answer:
Chemical energy in the grass is transformed into thermal energy in the rabbit.
Explanation: Hope this helps
Would water boil at Huntington Beach or at Big Bear. (hint, Huntington beach is at sea level, Big Bear is 6700 ft above sea level) Assume the amount of water and the air temperature are the same in both locations. Explain your answer in detail!
A student rings a brass bell with a frequency of 300 Hz. The sound wave
travels through brass, air, and glass. What is the wavelength of the wave in
brass?
Medium
Wave speed
(m/s)
Brass
4,700
Air
346
Glass
5,640
A. 0.64 m
B. 1.6 m
C. 0.064 m
D. 16 m
The wavelength of the wave in brass medium, given that the wave has a frequency of 300 Hz is 16 m (Option D)
How do I determine the wavelength in brass?The wavelength of a wave is defined according to the following formula:
Velocity (v) = wavelength (λ) × frequency (f)
Divide both sides by frequency
Wavelength (λ = Velocity (v) / frequency (f)
With the above formula, we can obtain the wavelength of the wave in the brass medium. Details below:
Frequency (f) = 300 HzWave speed in brass (v) of = 4700 m/sWavelength in brass (λ) = ?Wavelength (λ = Velocity (v) / frequency (f)
Wavelength in brass = 4700 m/s / 300 Hz
Wavelength in brass= 16 m
Thus, we can conclude that the wavelength is 16 m (Option D)
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is A bond a chemical attraction between two atoms?
Answer:
Yes, a chemical bond is a lasting attraction between two atoms. (I am not completely sure what you mean, but I hope this helps!)
research ocean currents and how they relate to heat transfer.
Answer:
The movement of this heat through local and global ocean currents affects the regulation of local weather conditions and temperature extremes, stabilization of global climate patterns, cycling of gases
